What is the right thing to do

Thank you for your comments so far, no one is saying yes just slip out, everyone so far has said that goodbye should be said.

My grandson is two, I feel that if I just slip away without the goodbye, it saves the upset, am I on my own with that thought ?

All little ones go through separation anxiety about the important people in their lives. My youngest grandson (two and a half) still sometimes has little fits when he is being driven home from my house, yelling "Other way! Back to Granna!" While flattering, this is also a bit upsetting, especially for his mum who may have to endure the shouting all the way home. He also has a bit of a grumble when mum leaves for work and he stays with me. However, we do the constant reassurance that you will see Mum/Granna again soon. He's now more inclined to say, "Bye, see you next week".

How young is your dear Grandson? Just keep it light telling him you will be back soon & perhaps ask him to count how many sleeps it will be etc until will be back again,try to involve him, by saying something like how many minutes on the clock has Nanny got left etc ... good luck

I think you should say goodbye. He might be more anxious wondering if you were going to vanish at any time, so even if he is upset, he does have certainty.

DD2 was a terrible 'goodbye' crier. Even now, as an adult, she has a problem with that word but she understands it's illogical so can control it. Develop a routine around goodbye and stick to it. Make it short and sweet and go. Your GS will cry for a while then be OK. The longer you draw out the goodbye the worse it will be. If you just disappear it will confuse him because he's not yet of an age to understand why you just disappear.